Typewriter



June 28, 1932. R. ATTI 1,864,521

TYPEWRITER Filed Feb. 6, '1929 Patented June 28, 1932 UNITED STATES.RALPH ATTI, or UNION CITY,

NEW JERSEY, ASSIGNOEI T CLAUDE '1. RICE, OF NEW YORK, N. Y. I

TYPEWRITER Application .filed February 6, 1929. Serial No. 337,757.

This invention relates to typewriters, particularly the class oftypewriters known as noiseless typewriters.

It is an object of the invention to provide an improved type action fortypewriters.

More specifically, one object of the invention is to provide a typeaction in which the typeis advanced to a point opposite the platen andis then pressed directly toward the le' platen.

It is a further object of the invention to provide a type action inwhich the type is first advanced to a position opposite the printingpoint and is then moved by the action of cams to efiect printing.

It is a further object of the invention to provide a type action inwhich the type is advanced by the movement of levers to a po- ,7 sitionopposite the printing point and is then 20" moved by the action of camsin a direction transverse to its first movement to effect printing. 7

lVith these and other objects in view the invention consists in thenovel devices and a combinations a representative embodiment of which isshown in the accompanyin drawing, and will be hereinafter described. Inthe drawing: i Fig. l is a fragmentary transverse sec- :3 'tionalelevation of a machineemb'odyingthe present invention, the type barbeing shown in its retracted or normal position.

Fig. 2 is a fragmentary transversesectional elevation showing the typein printing po- 21 sition.

The machine comprises a platen 10, and keys 11, pivoted at 12, and urgedto normal position by suitable means, such as springs I 13. Attached toeach of the keys 11 at an ap- (fl 'propriate point is a link 14 whichengages a lever 15, pivoted at 16. The arms of the levers 15 areproportioned to give the correct travel to the type bars which areassociated therewith in the manner to be present- (l' -ly explained, andthe levers are bent in such a way as to bring the arms to the correctposition to effect the proper movement of the type bar when any key isdepressed. Pivoted to each lever 15 is a link 17, having a :1 pivotalconnection at 18 with a foot 19 depending from a slidebar 20 which movesin a suitable guide way 211 in a fixed frame'21. A suitable cushioningmember 22 may be placed in the closed end of the guide way to reduce theshock and noise otherwise incident to the spring actuated return of theparts to normal position. i The invention contemplates advancing th typeto a position opposite the printing point on the platen, andsubsequentlypressing the type directly toward the platen'with substantial force. Theparticular arrangement of devices for this purpose which has beenselected for the purpose of illustration is constructed as follows.Toeachslide bar 20 is pivoted a type bar 23, provided with .a head 24:carrying one or more type 25. In the illustrated form of theinvention,when the parts are in normal position the type bars liesubstantially. within the guide ways 211. Suitable means, such aslightsprings 26, may be provided to ,hold the typebars fromprematurelyturning about their pivots. Therelative location of the parts is suchthat the first or forward movement of a type bar brings one of'the typethereon to a position substantially opposite but slightly removed fromthe printing point on the platen 10.

The movement of the type from the position just described, toward theplaten to ef- .80

fect printingmay' be accomplished in the following manner. The rearwardend of each type bar is provided with a small projecting stud or camfollower adapted to engage the peripheryofan enlarged head or cam on the35 link 17. Said cam comprises a long dwell or inactive surface .28,concentric with the pivot 18, and a sharply inclined active surface "29,terminating in a second dwell 30.

The arrangement is such that as one of the type 25 comes opposite theprinting point the cam follower 27. traverses.theinclined surface 29,rocking the .typebar about its pivot and pressing the type toward theplaten.

The operation of theillustrativeembodiment of the inventionmaybesummarized as follows; When a key 11 is depressed, rocking about pivot12. and tensioning its spring 13," its movement draws the link 14 s buta slight advance of the type bar.

downwardly, rocking lever 15 about its pivot 16. The movement of lever15 advances the link 17 and with it the slide bar 20 and its type bar23. At the same time the link 17 rotates about its pivot 18, the camfollower 27 transversing the concentric surface 28 of the head of link17.

Owing to the obliquity of the toggle formed by lever 15 and link 17 theinitial movement of a-key 11 effects a rapid advance of the type bar. Asthe toggle straightens (Fig. 2) the type bar advances more slowly, untiladjacent the printing position of the type a relatively long movement ofthe key eifecAts s the type comes opposite the platen the cam follower27 engages the incline 29, rocking the type bar aboutits pivot againstthe tension of spring 26, and forcefully pressing the type directlytoward the platen, thus making an impression from the type upon theplaten or a record sheet thereon. Upon the release of the key the partsare restored to normal (Fig. 1) position by the springs 13.

It isto be understood that the specific embodiment which has beenillustrated and described is but a representative form of inventionswhich may take other forms, all falling within the scope of the appendedclaims.

What is claimed is:

1. In a device of the character described, a platen, a key, a typebar'carrying type means to guide the movement of said type bar, and asingle train of connections intermediate said key and said, type barwhereby said type is first advanced in a substantial straight line totapoint opposite said platen and subsequently moved in a directiontransverse to its first movement to eflect printing on said platen, saidtrain of connections including a link to noiselessly stop the movementof the type bar.

2. In a device of the character described,

means mounted for rectilinear movement,

type carrying means pivoted to said first named means, and a singleactuating toggle link adapted to first rapidly move said first namedmeans while holding said type carrying means from rotation about itspivot, and cam means to subsequently rotate said type carrying meansabout its pivot.

3. In a device of the character described, a frame, a bar mounted forrectilinear movement upon said frame, a type carrier mounted on sa d barand actuatlng means for moving said bar and for moving said type carrierrelative to said bar, said actuating means comprlsing a toggle joint,oneof said toggle members being provided with a type depressing cam.

4. In a device of the character described, a key, a toggle lever, halfof said toggle lever being a bell crank pivoted to a fixed pivot,connections from said key to said toggle lenature to this specification.

ver, a type carrier and means whereby the movement of said toggle levereffects two substantially different movements of said type carrier, saidtoggle lever adapted to noiselessly stop the movement of said typecarrier.

5. In a device of the class described, a type carrier, and means forgiving said type carrier first a rectilinear movement and subsequently arotary movement comprising a toggle lever, a cam upon said toggle lever,and a cam follower upon said type carrier.

6. In a device of the class described, a type carrier, means for givingsaid type carrier two substantially different movements comprising atoggle lever a cam and a cam follower, one of said cam members beingmounted on said type carrier and the other cam member being mounted onsaid toggle lever.

7. In a device of the character described, a frame, a slide bar in saidframe, a type carrier pivoted to said slide bar, means for advancingsaid slide bar, a cam and cam follower associated with said means formoving said type carrier on its pivot, said cam being inactive duringthe advance of the slide bar and depressing the type bar after the fulladvance of the slide bar.

8. In a device of the class described, a type carrier pivoted to aslidable support, a toggle lever connected with said support, a cam onsaid toggle lever, and a cam follower on said type carrier co-operatingwith said cam, said cam having a long dwell thereon, said toggle leveradapted to move said type carrier in substantially rectilinear movementduring said period of dwell on said cam, and in rotary movement on thebalance of movement of said cam.

9. In a device of the class described, a platen, a type on a typecarrier, and means for advancing said type to'a point opposite saidplaten moving said type directly toward said platen and subsequentlyrestoring said type to normal position comprising a slidable 'member, apivotal connection between said slidable member and said type carrier, alever, a pivotal connection between said lever and said slidable member,a cam on said lever, a cam follower on said type carrier and resilientmeans for holding said cam follower in contact with said cam.,

In testimony whereof I have aflixed my sig- RALPH ATTI.

